Directly on the image,



Why inside the constructor of the Line, I would like to provide the default parameter values for aa and bb, there will be an error?
To solve the,

CodePudding user response:

No such written
Or
Point a={0, 0};
Or

Point a=Point (0, 0);

CodePudding user response:

A class object is the Point b, so in Line class initializes the a, b, use the following format, for your reference:

 class Line {

Point a, b; 
Public: 
//Line () {a, b; } 
The Line (int aa=0, int bb=0) : a (aa and bb) and b (aa and bb) 
{
//a.s etPoint (aa and bb);//the two sentences can omit 
//b.s etPoint (aa and bb); 
} 
Void showPoint () 
{
A.s howPoint (); 
B.s howPoint (); 
} 

The Line (Line & amp; L) {} 
~ the Line (); 
}; 

CodePudding user response:

The copy constructor in the Line:

 Line (Line & amp; L) 
{
A.s etPoint (L.A.G etx (), L.A.G ety ()); 
B.s etPoint (L.B.G etx (), L.B.G ety ()); 
}